Manchester United suffered a 3-1 defeat against Brentford at the weekend, with the club sitting 14th in the Premier League after six matches.
Ruben Amorim and his players are facing pressure, as the team has lost three matches, won two, and drawn one.
Amorim has been criticized for refusing to change his system, which many believe is a key reason for United's struggles.
Gary Neville has always been outspoken about his former club, and his latest review of Amorim was nothing less than brutal.
What did Neville say about Amorim after the latest defeat?
Neville admitted he was worried for Amorim's future with United after the loss on Saturday.
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Speaking to NBC Sports, Neville said, "I am very worried; there is no point in me sitting here and saying I’m not. The levels of performance, the results, and the substitutions yesterday.
"I saw something at the end of the Grimsby game that they lost in the Carabao Cup a couple of weeks ago, which was Mason Mount ending up at left wing-back.
"We admire managers who are stubborn and resilient around their system. We want them to stick to their plan, but when you have Mason Mount playing at left-back, you are going to look pretty stupid."
Neville dug into Amorim's tactics and his selections, continuing, "It has happened twice now, and it can’t happen. The first time I thought it was unforgivable, and yesterday it happened again.
"He changes his back three and his back five every single game, and the performances and the results are just unacceptable.
"I’m really, really worried. I would never go on television as I know how difficult a manager’s job can be and say a manager should be sacked, but I suspect the hierarchy at Manchester United are going to want to see a turnaround."
Manchester United news and related links
- Who should be next Man United manager? Assessing top candidates to replace Ruben Amorim
- Ruben Amorim record at Man United: Wins, losses, points, and other stats as Premier League giants flounder
- Ruben Amorim registers poor Premier League stat following Man United's defeat to Brentford